Product Description:

The RD51.1-4B-055-D-NN-FW is part of the RD 500 Drive Controllers series from Bosch Rexroth Indramat. As a drive controller, it interfaces between a three-phase supply and an AC motor to regulate torque and speed in automated processing lines. The unit is intended for conventional cabinet mounting, which supports integration into enclosed industrial control panels. Its cabinet-installed format keeps the power electronics centralized with other control hardware. This type of controller is commonly used where stable speed control and repeatable acceleration are required for process equipment.

The controller delivers a rated output of 55 kW and operates within an input window of 380 to 480 V. Its modulation method is U/f curve control, so voltage rises proportionally with frequency to keep motor flux stable across the speed range. This control method is suited to applications that need reliable variable-speed operation rather than high-end servo positioning. A built-in brake chopper is integrated on the DC bus to dissipate regenerated energy and help prevent overvoltage trips during deceleration or overhauling loads. Heat is removed by a plug-through cooler, which transfers losses through the rear panel and helps keep heat away from the cabinet interior.

Input power reaches the DC link through a 3 x AC converter section, and conducted emissions are reduced by the integrated mains filter included in the housing. This helps simplify panel integration where reduced conducted noise on the supply lines is needed. The electronics are in design generation 1. The drive allows an input tolerance of ±10 %, so it remains functional under moderate line fluctuations. The functions option is not equipped, so no extended application macros or I/O boards are installed at the factory, and the open slots remain available for later expansion.